Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Vulnerability of young oak seedlings (Quercus robur L) to embolism: responses to drought and to an inoculation with Ophiostoma querci (Georgevitch) Nannf. | 493 Ann Sci For 1994 51 493-504 Elsevier INRA Original article Vulnerability of young oak seedlings Quercus robur L to embolism responses to drought and to an inoculation with Ophiostoma querci Georgevitch Nannf G Simonin 1 H Cochard 2 c Delatour1 A Granier2 E Dreyer2 INRA Nancy Laboratoire de Pathologie Forestiere 54280 Champenoux 2 Équipe Bioclimatologie et Écophysiologie Unite Ẽcophysiologie Forestiere INRA Nancy 54280 Champenoux France Received 7 June 1993 accepted 27 October 1993 Summary Possible interactions between an infection with Ophiostoma querci and water stress on pedunculate oak Quercus robur were tested with potted saplings o querci was inoculated into the stems of 3-year-old saplings and a severe drought was imposed for about 40 d. Drought promoted an irreversible decline in total leaf specific conductance of all saplings direct measurement of losses of hydraulic conductivity in twigs and petioles revealed that a strong embolization occurred in the vessels as soon as minimal leaf water potential decreased below MPa. This vulnerability to cavitation on rooted seedlings was in agreement with earlier data obtained on cut branches from the same species left to freely dehydrate a slight artifact was probably due to the onset of occlusions of embolised vessels in the rooted plants. The presence of fungal spores in the stems did not induce any modification in these water relations on well-watered or stressed seedlings. The role of o querci in the oak decline symptoms as occurring in Europe may therefore be questioned. water stress embolism oak Ophiostoma querci I hydraulic conductivity water relationships oak decline Resume Vulnérabilité de jeunes semis de chêne pédonculé Quercus robur à I embolie réponses à la sécheresse et à une inoculation avec Ophiostoma quercl. Les effets potentiels d une infection par Ophiostoma querci sur la réponse à la sécheresse de jeunes plants de chêne pédonculé ont été testés. o querci a été injecte dans le tronc de .
